Viktor Lvovich Korchnoi is a professional chess player, author and until recently the oldest active grandmaster on the tournament circuit. He is widely considered the strongest player to have never become World Chess Champion.
Born in Leningrad, Soviet Union, Korchnoi defected to the Netherlands in 1976, and has been residing in Switzerland for many years. Korchnoi played three matches against Anatoly Karpov. In 1974, he lost the Candidates final to Karpov, who was declared world champion in 1975 when Bobby Fischer refused to defend his title. He then won two consecutive Candidates cycles to qualify for World Championship matches with Karpov in 1978 and 1981, losing both.
Korchnoi was a candidate for the World Championship on ten occasions. He was also a four-time USSR chess champion, a five-time member of Soviet teams that won the European championship, and a six-time member of Soviet teams that won the Chess Olympiad. In September 2006, he won the World Senior Chess Championship.
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